Chapter 32 An Introduction to Animal DiversityWhat is an animal?Multicellular, heterotrophic eukaryote ingestionStructural support from structural proteins NOT cell wallsNervous tissue & muscle tissue for impulse conduction & movementSexual reproduction with motile sperm swimming to non-motile eggHow did animals evolve?- Current animal development
Figure 32.2 Early embryonic development in animals (layer 1)Cleavage cell division w/out cytokinesis- More cells but same total volume no cell growth
Figure 32.2 Early embryonic development in animals (layer 2)Blastula hollow ball of cells-coel opening or cavity
Figure 32.2 Early embryonic development in animals (layer 3)Ectoderm outside layerEndoderm inside layerGastrulation movement of cells to form 2 layersBlastopore opening where cells move into
Chapter 32 An Introduction to Animal DiversityWhat is an animal?Multicellular, heterotrophic eukaryote ingestionStructural support from structural proteins NOT cell wallsNervous tissue & muscle tissue for impulse conduction & movementSexual reproduction with motile sperm swimming to non-motile eggHow did animals evolve?Current animal developmentCurrent hypothesis
Figure 32.4 One hypothesis for the origin of animals from a flagellated protist
Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetryNone (sponge) Radial multiple central axis cuts provide mirror imagesOnly have top & bottomBilateralOnly 1 central axis cut provides a mirror imageHas top, bottom, left & right
H-W LabAll 6 sectionsPersonal AcctData for all 3 Cases including NEW p & qDiscussion questions for all 3 Cases6 practice problems at the endNot Exercise 8A or Case IV
Protist ID Lab-All 6 sections-Pre-lab from in-class notes-Personal acct-include characteristics that you keyed out-name of organism-drawing of organism
Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetry & TISSUESNone (sponge) Radial multiple central axis cuts provide mirror imagesOnly have top & bottomDiploblastic 2 cell layersEctoderm Endoderm BilateralOnly 1 central axis cut provides a mirror imageHas top, bottom, left & rightTriploblastic 3 cell layersEctoderm & endodermMesoderm in between ecto- & endodermCephalization movement of sensory equipment towards the anterior end of the organism associated with movement
Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetry & tissues Body cavitiesAcoelomates without a body cavityPseudocoelomates false body cavity cavity not completelylined with tissue derived from mesodermCoelomates body cavity completely lined with tissue from mesoderm
Figure 32.8 Body plans of triploblastic animals
Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetry & tissues Body cavitiesDevelopmental planProtostomeDeuterostome
Figure 32.9 A comparison of protostome and deuterostome development
Figure 32.10 One hypothesis of animal phylogeny based mainly on morphological and developmental comparisons
Figure 32.11 One hypothesis of animal phylogeny based mainly on molecular data
Figure 32.12 EcdysisEcdysozoa secrete an exoskeleton and moltNematoda & Arthropoda
Figure 32.13 Characteristics of lophotrochozoans
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